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Kaley Cuoco has grown up on our TV screens, first as John Ritter's daughter on "8 Simple Rules," then as aspiring actress-turned-pharmaceutical rep Penny on CBS' hit comedy "The Big Bang Theory," which will end after its 12th season in May. Click forward to revisit the life and career of Cuoco, seen here at the 76th Golden Globe Awards in January 2019. Dan MacMedan, Dan MacMedan-USA TODAY NETWORK

In 2000, Cuoco, right, played 'Brady Bunch' actress Maureen McCormick in 2000's 'Growing Up Brady,' a TV movie about life behind the scenes of the classic sitcom. It co-starred a pre-'O.C.', Adam Brody, as Barry Williams and Caitlin Cullum as Eve Plumb. Her other early credits include 'Northern Exposure' and 'Ellen,' the '90s sitcom starring Ellen DeGeneres. GARY NULL, NBC

Originally titled '8 Simple Rules for Dating My Daughter,' the series focused on Ritter's character, Paul Hennessy, a stay-at-home dad whose wife just went back to work. But Ritter died on Sept. 11, 2003, as the show was in production for its second season. The show was canceled in 2005, after its third. GALE M. ADLER, BC

'8 Simple Rules' wrote the death of Ritter into its storyline, killing off his character, Paul Hennessy, too. Here, Cuoco, right, poses with the rest of the cast while rehearsing for an episode addressing his sudden offscreen death. (From left: Amy Davidson, Katey Sagal, James Garner, Martin Spanjers and Cuoco.) Dan MacMedan, USA TODAY

On Sept. 24, 2007, Cuoco debuted as Penny, the female lead in CBS' 'The Big Bang Theory.' Her character, the next-door neighbor of physicists Sheldon Cooper (Jim Parsons) and Leonard Hofstadter (Johnny Galecki), was not in the original pilot. The guys experts on quantum physics, but when it comes to dealing with everyday life on earth, they're lost in the cosmos. Then they meet their sexy new neighbor, Penny. ROBERT VOETS, CBS

The awkward courtship of Leonard and Penny put the relationship in what would evolve into a relationship comedy. It was love at first sight for Leonard but he wouldn't officially get the girl until the beginning of 'Big Bang's third season. It was a different story offscreen: The couple managed to date quietly for the first two years of the show, with no one the wiser until they broke up. Sonja Flemming, CBS

The 'Big Bang Theory' earned its first Emmy nominations in 2009 following its second season. Here, Kaley Cuoco and co-stars Jim Parsons and Johnny Galecki appear onstage as presenters at that year's telecast. ROBERT HANASHIRO, USA TODAY

The more time Penny spent around the boys on 'Big Bang,' the more science and nerd trivia knowledge she began to accumulate. In Season 4, they recruited her for their Justice League team Halloween costume. CLIFF LIPSON, CBS

Season 4 also brought more gender parity to 'Big Bang': Mayim Bialik, center, and Melissa Rauch, second right, who play the love interests for Sheldon and Wolowitz (Simon Helberg, right), respectively, were promoted to series regulars. Monty Brinton, AP

In addition to a steadily increasing salary from her day job, Cuoco began to rake in endorsement cash. She served as a pitchwoman for Priceline and Toyota. Here, she appears in the carmaker's 2013 Super Bowl spot. Toyota

She arrived at the 2014 People's Choice Awards with a rock on her left ring finger and left carrying another: the Poeple's Choice Award for favorite comedic TV actress. Soon, she was going by Kaley Cuoco-Sweeting professionally. Frazer Harrison, Getty Images

In the summer of 2014, Cuoco, Parsons and Galecki graduated to 'Friends' money, earning $1 million per episode, while Simon Helberg and Kunal Nayyar got bumped up to $750,000 per episode. Three years later, all five gave back some of that money, taking a voluntary paycut so co-stars Mayim Bialik and Melissa Rauch could each be paid $500,000 per episode. Michael Yarish, CBS

In 'The Wedding Ringer, Cuoco starred as the future bride to Josh Gad's character, who had to rent a best man (Kevin Hart). The trio posed with then-Sony Pictures boss Amy Pascal at the movie's January 2015 premiere in Los Angeles. Alberto E. Rodriguez, Getty Images

'Big Bang' fans had already met Penny's dad (Keith Carradine) in a previous episode, but the second wedding introduced us to her mom (Katey Sagal, who also played her mom on '8 Simple Rules'). Monty Brinton, Monty Brinton, CBS

A decade after 'Big Bang' changed both their lives, former real-life couple Galecki and Cuoco remain close friends. Here, they pose at a party in January 2017. Matt Winkelmeyer, Getty Images for Entertainment Weekly

By the spring of 2016, Cuoco, a longtime horsewoman, was dating professional equestrian Karl Cook. By the end of the year, he was hitting the red carpet with her at events like December's Critics Choice Awards. Jordan Strauss, Jordan Strauss/Invision/AP

In October, Cuoco also announced that she'll voice Harley Quinn for an adult animated comedy premiering in 2019 on the DC Universe streaming service. “I have cussed and screamed more than I think I ever have, and it has been a fricking blast," she told USA TODAY. "It's very freeing.” DC ENTERTAINMENT

Simon Helberg, who plays Howard, married wife Jocelyn Towne the summer before "Big Bang" went on the air and has had two children since the show's debut. Melissa Rauch, who plays his wife Bernadette, married husband Winston before she joined the show, but welcomed her first child in 2017.

Mayim Bialik, who plays newlywed Amy, was married with two sons before joining the series but divorced in 2012. She's since spoken on social media about a mystery boyfriend with whom she has yet to go public.

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Demonstrators complete a loop of downtown during a nationwide protest following the resignation of attorney general Jeff Sessions and President Donald Trump's appointment of Matthew Whitaker at Piatt Park in downtown Cincinnati on Thursday, Nov. 8, 2018. Sam Greene

Over one-hundred people attended a rally in front of Senator Chuck Schumer's local office in Peekskill, N.Y. calling for the protection of the Robert Mueller's investigation Nov. 8, 2018. The protest, which coincided with similar protests across the nation, came in the wake of President Trump's firing of Attorney General Jeff Sessions. Seth Harrison/The Journal News

Over one-hundred people marched from Senator Chuck Schumer's local office in Peekskill to downtown Peekskill during a rally calling for the protection of the Robert Mueller's investigation Nov. 8, 2018. The protest, which coincided with similar protests across the nation, came in the wake of President Trump's firing of Attorney General Jeff Sessions. Seth Harrison/The Journal News

Heather Wehrman, of Anderson Township, stands under a statue of William Henry Harrison with a sign calling for the impeachment of President Donald Trump during a nationwide protest following the resignation of attorney general Jeff Sessions and Trump's appointment of Matthew Whitaker at Piatt Park in downtown Cincinnati on Thursday, Nov. 8, 2018. Sam Greene

Demonstrators complete a loop of downtown during a nationwide protest following the resignation of attorney general Jeff Sessions and President Donald Trump's appointment of Matthew Whitaker at Piatt Park in downtown Cincinnati on Thursday, Nov. 8, 2018. Sam Greene

Demonstrators complete a loop of downtown during a nationwide protest following the resignation of attorney general Jeff Sessions and President Donald Trump's appointment of Matthew Whitaker at Piatt Park in downtown Cincinnati on Thursday, Nov. 8, 2018. Sam Greene

Protesters gather and hold banners in front of the White House in Washington, Thursday, Nov. 8, 2018, as part of a nationwide "Protect Mueller" campaign demanding that Acting U.S. Attorney General Matthew Whitaker recuse himself from overseeing the ongoing special counsel investigation. Manuel Balce Ceneta, AP

People hold signs as they protest against the US president's alleged interference in the Robert Mueller investigation outside the White House in Washington, DC, on November 8, 2018. Andrew Caballero-Reynolds/Getty Images

People protest and march against US President Donald Trump's alleged interference in Robert Mueller investigation in New York City on November 8, 2018. - President Donald Trump was accused on November 8, 2018, of pushing America toward a constitutional crisis after his firing of the attorney general cast doubt over the future of an explosive probe into election collusion with Russian agents. Bryan R. Smith/Getty Images

People protest and march against US President Donald Trump's alleged interference in Robert Mueller investigation in New York City on November 8, 2018. - President Donald Trump was accused on November 8, 2018, of pushing America toward a constitutional crisis after his firing of the attorney general cast doubt over the future of an explosive probe into election collusion with Russian agents. Bryan R. Smith/Getty Images

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The stars come out to shine at the 2018 People's Choice Awards in Santa Monica, Calif. Jimmy Fallon takes over the shot while Christina Hendricks, (back L-R),Retta and Mae Whitman stand amused on the red carpet. Click ahead to see more celebs. Matt Winkelmeyer/Getty Images